Update Link.php to support sites behind Cloudflare #2
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Sites behind Cloudflare can access the IP address of the visitor by looking for a HTTP_CF_CONNECTING_IP header.
Cloudflare does set the HTTP_X_FORWARDED_FOR header, but if the visitor is behind a Proxy themselves, it starts getting weird and hard to parse. The HTTP_CF_CONNECTING_IP header is the easiest way.
From https://support.cloudflare.com/hc/en-us/articles/200170986-How-does-CloudFlare-handle-HTTP-Request-headers-